Lithium ion battery with uniform and stable current density

Abstract

The invention discloses a lithium ion battery with uniform and stable current density. The lithium ion battery comprises a positive pole piece, a negative pole piece, and a diaphragm and electrolyte arranged between the positive pole piece and the negative pole piece; a positive pole comprises positive pole fluid, lithium iron phosphate particles, a conductive agent and a positive pole bonding agent; a negative pole comprises negative pole active materials, a negative pole bonding agent, a preservative, a thickening agent and de-ionized water. According to the lithium ion battery with the uniform and stable current density, the conductivity of the pole pieces is improved, the resistance of the battery is reduced and the electric conductivity of the pole pieces in a unit area is improved; the stability is placing negative pole slurry of the lithium ion battery for a long time is improved.

Description

technical field [0001] The invention relates to batteries, in particular to a lithium ion battery with uniform and stable current density. Background technique [0002] With the rapid development of miniaturization and light weight of electronic instruments, people have higher and higher requirements for chemical power sources used in electronic instruments. Compared with other traditional secondary batteries, lithium-ion batteries have the advantages of high voltage, high energy density, long cycle life, low self-discharge, and no memory effect, so they have been rapidly developed and widely used. [0003] In lithium-ion batteries, the selection and quality of cathode materials have a very important impact on lithium-ion batteries. At present, the commonly used cathode materials are lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), lithium nickel oxide (LiNiO2), nickel-cobalt-manganese multi-lithium compound and lithium iron phosphate (LiFePO4). Environmen...

AI Technical Summary

Problems solved by technology

In the current lithium battery industry, due to the uneven dispersion of the binder, the impedance distribution of the pole pieces is uneven, resulting in different current densities. For lithium-ion batteries, increasing the amount of binder can meet the needs of lithium iron phosphate powder materials and collectors. The bonding tightness between them, but the amount of active material is relatively reduced, resulting in a decrease in the energy density of lithium iron phosphate lithium-ion batteries

However, for the negative electrode of lithium-ion batteries, the stability of the negative electrode slurry deteriorates for a long time, and sedimentation and agglomeration occur, which makes the performance consistency of the battery poor and affects product quality.